Objective: to introduce the method of joint debridement combined with high tibial osteotomy for osteoarthritis of varus Knee-cap and its better therapeutic outcome.

目的：介绍关节清理加胫骨高位截骨术治疗内翻型膝骨性关节炎的方法及较好的治疗效果。

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Nomatter transporting gas or oil, there are pipelines, there are pipe fittings such as bend pipe, reducing joint, T-pipe, pipe cap and so on.

无论是用管道输气、输油，凡有管道的地方，都少不了弯头、异径接头、三通、管帽等管件。

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Leather cap type pig has higher abrasion during pigging gas steel pipeline. Furthermore, various elbow bend and tee joint need different suitable length pig or else easy to cause pipeline clog.

在燃气钢质管道清管过程中，皮碗式清管器受到的磨损较大，而且管道中各类弯头和三通件要求清管器的长度合适，否则容易造成卡堵。

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